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bit of an odd bug

php.internals

Gareth Ardron

21 years ago

Ok, I'm in need of a sanity check here.

step one:
$input = "foo";
$scanning_class = "clamav";
$result = $scanning_class::scanBuffer($input);
now this fails with a "Parse error: parse error, unexpected
T_PAAMAYIM_NEKUDOTAYIM"

So ok, you can't put variables at the front on a class call like that.
Minor bug I'm thinking at this point, but I wonder if I can work round
it. So, onto step two:
$input = "foo";
$scanning_class = "clamav";
$func = $scanning_class."::scanBuffer";
$result = $func($input);
Which fails with a "Fatal error: Call to undefined function
clamav::scanBuffer()"

Just doing:
$result = clamav::scanBuffer($input);
of course works absolutly fine.

Somebody just tell me that this isn't exactly expected behaviour and
it's a minor bug

this is all on 5.0.3 btw.

Cheers.

--
Gareth Ardron

Nicolas Bérard Nault

21 years ago

Hi,

This looks a lot more like a limitation of the Zend engine to me. The
second observation you made is correct, at least, from my point of
view. You are literally calling a function named clamav::scanBuffer(),
not the member function of the class clamav.

Hope this helps,
Nicolas Bérard Nault.

On Tue, 04 Jan 2005 02:59:22 +0000, Gareth Ardron <gareth@fission.org.uk> wrote:

Adam Maccabee Trachtenberg

21 years ago

On Tue, 4 Jan 2005, Gareth Ardron wrote:

> Somebody just tell me that this isn't exactly expected behaviour and
> it's a minor bug

This is a known limitation. I suggest using the reflection classes to
work around this.

class foo {
static function bar() {
print "static method!\n";
}
}

$class = 'foo';
$method = 'bar';
$x = new ReflectionMethod($class, $method);
$x->invoke(NULL);

-adam

--
adam@trachtenberg.com | http://www.trachtenberg.com
author of o'reilly's "upgrading to php 5" and "php cookbook"
avoid the holiday rush, buy your copies today!

Chris

21 years ago

That, I'm afraid, is expected behavior, though I believe you can use:

call_user_func(array($scanning_class,'scanBuffer'));

http://www.php.net/call_user_func

I *could* be wrong though

Chris

Gareth Ardron wrote:

Jason Sweat

21 years ago

On Tue, 04 Jan 2005 02:59:22 +0000, Gareth Ardron <gareth@fission.org.uk> wrote:

> Ok, I'm in need of a sanity check here.
>
> step one:
> $input = "foo";
> $scanning_class = "clamav";
> $result = $scanning_class::scanBuffer($input);
> now this fails with a "Parse error: parse error, unexpected
> T_PAAMAYIM_NEKUDOTAYIM"
>
> So ok, you can't put variables at the front on a class call like that.
> Minor bug I'm thinking at this point, but I wonder if I can work round
> it. So, onto step two:
> $input = "foo";
> $scanning_class = "clamav";
> $func = $scanning_class."::scanBuffer";
> $result = $func($input);
> Which fails with a "Fatal error: Call to undefined function
> clamav::scanBuffer()"
>
> Just doing:
> $result = clamav::scanBuffer($input);
> of course works absolutly fine.
>
> Somebody just tell me that this isn't exactly expected behaviour and
> it's a minor bug
>
> this is all on 5.0.3 btw.

Hi Gareth,

In addition to the other options people have mentioned, you could also
use the old standby of:
eval("\$result = $scanning_class::scanBuffer(\$input);");

Regards,
Jason
http://blog.casey-sweat.us/

Gareth Ardron

21 years ago

Jason Sweat wrote:

>Hi Gareth,
>
>In addition to the other options people have mentioned, you could also
>use the old standby of:
>eval("\$result = $scanning_class::scanBuffer(\$input);");
>
>

Cheers for all the replies, people. I may have a bit of a prod at the
internals this evening though, as this is a bloody annoying thing when
you're trying to build up a highly modularised system - and I'd like the
code as clean as possible really, not jumping through hoops like use
reflection API to do this as it has to be maintained by people who
haven't yet encountered that type of thing.

Cheers,

--
Gareth Ardron

Wez Furlong

21 years ago

If you want to do this kind of thing, why not do it properly?

$foo = new $scanning_class;
$foo->scanBuffer($input);

that is, after all, what "extends" is all about.

--Wez

On Tue, 04 Jan 2005 15:01:32 +0000, Gareth Ardron <gareth@fission.org.uk> wrote:

Jochem Maas

21 years ago

Wez Furlong wrote:

> If you want to do this kind of thing, why not do it properly?
>
> $foo = new $scanning_class;
> $foo->scanBuffer($input);
>
> that is, after all, what "extends" is all about.
>
> --Wez

hihi, that why Wez get the 'King' prefix and everyone doesn't :-)

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